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Discontinued Operations and Dispositions - Schedule of Income (Loss) from Discontinued Operations Harsco Rail (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total revenues | $ 573,627 | $ 596,968 | $ 1,783,937 | $ 1,766,689
Selling, general and administrative expenses | 89,183 | 93,513 | 266,763 | 262,175
Research and development expenses | 888 | 902 | 2,692 | 2,441
Other expense (income), net | (40) | (2,865) | (6,600) | 4,052
Total costs and expenses | 536,255 | 568,208 | 1,689,497 | 1,672,327
Operating income (loss) from continuing operations | 37,372 | 28,760 | 94,440 | 94,362
Interest income | 981 | 1,722 | 6,113 | 4,796
Interest expense | 28,813 | 27,552 | 84,869 | 78,956
Defined benefit pension income (expense) | 4,257 | 5,430 | 12,599 | 16,159
Income (loss) from continuing operations before income taxes and equity income | 2,305 | (5,306) | (5,602) | (3,856)
Income tax benefit (expense) from continuing operations | 13,437 | 3,498 | 31,372 | 26,846
Income (loss) from continuing operations | (11,094) | (8,955) | (37,058) | (31,295)
Revision of Prior Period, Adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cost of services and products sold | 62,185 |  | 181,606 |
Harsco Rail Segment | Revision of Prior Period, Adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total revenues | 72,380 |  |  | 226,280
Selling, general and administrative expenses | 9,124 |  |  | 29,001
Research and development expenses | 631 |  |  | 1,494
Other expense (income), net | 1,455 |  |  | 2,912
Total costs and expenses | 73,395 |  |  | 215,013
Operating income (loss) from continuing operations | (1,015) |  |  | 11,267
Interest income | 44 |  |  | 96
Interest expense | (813) |  |  | (2,165)
Defined benefit pension income (expense) | 6 |  |  | 19
Income (loss) from continuing operations before income taxes and equity income | (1,778) |  |  | 9,217
Income tax benefit (expense) from continuing operations | 611 |  |  | (5,495)
Income (loss) from continuing operations | (1,167) |  |  | 3,722
Service revenues | Harsco Rail Segment | Revision of Prior Period, Adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total revenues |  | 17,806 |  | 36,291
Cost of services and products sold |  | 11,425 |  | 24,341
Product Revenues |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total revenues | 85,495 | 106,177 | 291,368 | 332,375
Cost of services and products sold | $ 80,821 | 93,389 | $ 258,227 | 277,086
Product Revenues | Harsco Rail Segment | Revision of Prior Period, Adjustment |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total revenues |  | 54,574 |  | 189,989
Cost of services and products sold |  | $ 50,760 |  | $ 157,265

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